Yea those Vipars are fast! They have bigger motors & more TQ. On the secondary vac parts, I sent you a message.
I still like the view from under the hood on a Z though. Not too many cars have a look like ours.
I don't see why you can't just graft on the old connector. I mean I'd do that. What could happen if it's done the way you say? It's not like the thing is under water all the time. I don't see a problem with you method & plan. JMHO.
On the vacuum hose assembly, you can't get it from anyone or any where? I don't see why if you can get the correct size hose why you can't do what you propose. I'm not a mechanic so I don't know that I'm correct. Vacuum is vacuum right? Heck I read somewhere that one owner took the trouble to get copper tubing in a size that was close and made his own that way.
Tom